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Stock-Based Compensation (Tables)
 9 Months Ended
Oct. 31, 2021
Share-based Payment Arrangement [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
The awards available for grant under the above Plans for the periods presented were as follows (in thousands):
October 31, 2021January 31, 2021
Available at beginning of period
4,796 1,540 
Awards authorized22,532 5,788 
Options granted (7,919)(4,622)
RSUs granted(3,000)— 
Options cancelled and forfeited1,701 1,970 
Options repurchased90 120 
Available at end of period
18,200 4,796 
Share-based Payment Arrangement, Option, Activity
The following table summarizes options activity under the 2015 Plan, and related information:
Number of Stock Options Outstanding (in thousands)Weighted Average Exercise PriceWeighted Average Remaining YearsAggregate Intrinsic value (in millions)
Balances at January 31, 2021
16,043 $6.33 8.39$166.6 
Options granted7,919 $18.68 8.92
Options exercised(2,539)$5.93 5.65
Options cancelled(77)$5.64 — 
Options forfeited(1,624)$10.04 — 
Balances at October 31, 2021
19,722 $11.04 8.17$1,995.1 
Exercisable at October 31, 2021
19,722 
Options vested at October 31, 2021
6,266 $4.61 6.60$674.1 
Options expected to vest at October 31, 2021
13,456 $14.03 8.89$1,321.0 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair value of each stock option grant was estimated on the date of grant, using a Black-Scholes option-pricing model, with the following weighted-average assumptions:
Three Months Ended October 31,Nine Months Ended October 31,
2021202020212020
Risk-free interest rate0.89 %0.38 %1.10 %0.51 %
Weighted-average volatility43.80 %32.20 %43.50 %31.60 %
Weighted-average expected term (in years)6.106.006.106.00
Dividend yield— %— %— %— %
Share-based Payment Arrangement, Expensed and Capitalized, Amount
The Company recognized stock-based compensation expense (excluding the expense related to the tender offers - “Note 16. Related Party Transactions” as follows (in thousands):
Three Months Ended October 31,Nine Months Ended October 31,
2021202020212020
Cost of revenue$331 $74 $722 $206 
Research and development2,147 635 4,653 1,902 
Sales and marketing2,562 813 5,688 2,319 
General and administrative3,539 534 6,179 1,251 
Total stock-based compensation expense, excluding tender offers$8,579 $2,056 $17,242 $5,678